<template>
  <!-- This footer should be hidden by default and shown when there are todos -->
  <footer class="footer">
    <!-- This should be `0 items left` by default -->
    <span class="todo-count"
      >剩余<strong>{{ shengyu }}</strong></span
    >
    <!-- Remove this if you don't implement routing -->
    <ul class="filters">
      <li>
        <a
          :class="{ selected: flag === 1 }"
          href="#/"
          @click="$emit('changeFlag', 1)"
          >全部任务</a
        >
      </li>
      <li>
        <a
          :class="{ selected: flag === 2 }"
          href="#/active"
          @click="$emit('changeFlag', 2)"
          >进行中</a
        >
      </li>
      <li>
        <a
          :class="{ selected: flag === 3 }"
          href="#/completed"
          @click="$emit('changeFlag', 3)"
          >已完成</a
        >
      </li>
    </ul>
    <!-- Hidden if no completed items are left ↓ -->
    <button class="clear-completed" @click="$emit('clearCompleted')">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  props: ["list", "flag"],
  computed: {
    shengyu() {
      return this.list.filter((item) => item.isDone === false).length;
    },
  },
};
</script>

<style>
</style>